Math Calculators

Frequently Asked Questions

What is the Pythagorean theorem?

The Pythagorean theorem states that in a right triangle, the square of the hypotenuse equals the sum of squares of the other two sides: a² + b² = c². It is one of the most fundamental relationships in geometry.

What is the difference between permutations and combinations?

Permutations consider the order of items (arrangements), while combinations do not (selections). For example, choosing 3 winners from 10 people where order matters uses permutations; where order does not matter uses combinations.

How do I calculate standard deviation?

Standard deviation measures the spread of data points from the mean. Calculate it by finding the square root of the variance: take each data point's difference from the mean, square it, average the squares, and take the square root.